046d397987
The state machine is used to convert a stream of UTF8 data into UCS4 characters. It is slightly based on the machine found in the wayland-compositor demos. Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
94 lines
3.6 KiB
C
94 lines
3.6 KiB
C
/*
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* kmscon - Unicode Handling
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*
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* Copyright (c) 2011 David Herrmann <dh.herrmann@googlemail.com>
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* Copyright (c) 2011 University of Tuebingen
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Unicode Handling
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* The main goal of the symbol(_table) functions is to provide a datatype which
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* can contain the representation of any printable character. This includes all
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* basic Unicode characters but also combined characters.
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* To avoid all the memory management we still represent a character as a single
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* integer value (kmscon_symbol_t) but internally we allocate a string which is
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* represented by this value.
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*
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* A kmscon_symbol_t is an integer which represents a single character point.
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* For most Unicode characters this is simply the UCS4 representation. In fact,
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* every UCS4 characters is a valid kmscon_symbol_t object.
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* However, Unicode standard allows combining marks. Therefore, some characters
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* consists of more than one Unicode character.
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* A kmscon_symbol_table object provides all those combined characters as single
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* integers. You simply create a valid base character and append your combining
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* marks and the table will return a new valid kmscon_symbol_t. It is no longer
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* a valid UCS4 value, though. But no memory management is needed as all
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* kmscon_symbol_t objects are simple integers.
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*/
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#ifndef KMSCON_UNICODE_H
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#define KMSCON_UNICODE_H
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#include <inttypes.h>
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#include <stdlib.h>
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/* symbols and symbol table */
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struct kmscon_symbol_table;
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typedef uint32_t kmscon_symbol_t;
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extern const kmscon_symbol_t kmscon_symbol_default;
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int kmscon_symbol_table_new(struct kmscon_symbol_table **out);
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void kmscon_symbol_table_ref(struct kmscon_symbol_table *st);
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void kmscon_symbol_table_unref(struct kmscon_symbol_table *st);
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kmscon_symbol_t kmscon_symbol_make(uint32_t ucs4);
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kmscon_symbol_t kmscon_symbol_append(struct kmscon_symbol_table *st,
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kmscon_symbol_t sym, uint32_t ucs4);
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const uint32_t *kmscon_symbol_get(const struct kmscon_symbol_table *st,
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kmscon_symbol_t *sym, size_t *size);
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const char *kmscon_symbol_get_u8(const struct kmscon_symbol_table *st,
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kmscon_symbol_t sym, size_t *size);
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void kmscon_symbol_free_u8(const char *s);
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/* utf8 state machine */
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struct kmscon_utf8_mach;
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enum kmscon_utf8_mach_state {
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KMSCON_UTF8_START,
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KMSCON_UTF8_ACCEPT,
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KMSCON_UTF8_REJECT,
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KMSCON_UTF8_EXPECT1,
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KMSCON_UTF8_EXPECT2,
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KMSCON_UTF8_EXPECT3,
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};
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int kmscon_utf8_mach_new(struct kmscon_utf8_mach **out);
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void kmscon_utf8_mach_free(struct kmscon_utf8_mach *mach);
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int kmscon_utf8_mach_feed(struct kmscon_utf8_mach *mach, char c);
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uint32_t kmscon_utf8_mach_get(struct kmscon_utf8_mach *mach);
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#endif /* KMSCON_UNICODE_H */
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